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Home >> Lexus >> 2009 >> LS 600hL >> Repair and Diagnosis >> External Pages >> Different car >> Section 174 (Can Communication - Stop Mode Diagnostics, Bus Line Troubleshooting) >> Open in CAN Main Wire >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Operating the power switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire
    CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
    NOTE:
    • After the power switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the power switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
    • When disconnecting the cable, some systems need to be initialized after the cable is reconnected (see INITIALIZATION ).
  2. CHECK DLC3 
    1. Measure the resistance according to the value(s) in the table below

      Result 

    RESULT REFERENCE

    Tester Connection Switch Condition Measured Resistance Proceed to
    L31-6 (CANH) - L31-14 (CANL) Power switch OFF 108 to 132 Ω OK
    L31-6 (CANH) - L31-14 (CANL) Power switch OFF 132 Ω or higher NG
    Fig 1: Identifying L31 DLC3 Connector Terminals
    G04953654Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NOTE: When the measured value is 132 Ω or higher and a CAN communication system diagnostic trouble code is output, there may be fault besides disconnection of the DLC3 branch wire. For that reason, troubleshooting should be performed again from "HOW TO PROCEED WITH TROUBLESHOOTING" (see HOW TO PROCEED WITH TROUBLESHOOTING ) after repairing the trouble area.

    NG: REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CANH, CANL) 

    OK: Go to next step 

  3. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 2 JUNCTION CONNECTOR - ECM) 
    1. Disconnect the L97 No 2 junction connector.
    2. Measure the resistance according to the value(s) in the table below

      Standard resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Switch Condition Specified Condition
    L97-4 (CANH) - L97-15 (CANL) Power switch OFF 108 to 132 Ω
    Fig 2: Identifying L97 No 2 Junction Connector Terminals
    G04953655Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  5

    OK: Go to next step 

  4. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 2 JUNCTION CONNECTOR - CENTER AIRBAG SENSOR) 
    1. Measure the resistance according to the value(s) in the table below

      Standard resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Switch Condition Specified Condition
    L97-1 (CANH) - L97-12 (CANL) Power switch OFF 108 to 132 Ω
    Fig 3: Identifying L97 No 2 Junction Connector Terminals
    G04953656Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  13

    OK: REPLACE NO. 2 JUNCTION CONNECTOR 

  5. CONNECT CONNECTOR 
    1. Reconnect the L97 No 2 junction connector
  6. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 JUNCTION CONNECTOR - ECM) 
    1. Disconnect the A67 No. 1 junction connector
    2. Measure the resistance according to the value(s) in the table below

      Standard resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Switch Condition Specified Condition
    A67-9 (CANH) - A67-20 (CANL) Power switch OFF 108 to 132 Ω
    Fig 4: Identifying A67 No 1 Junction Connector Terminals
    G04953657Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  8

    OK: Go to next step 

  7. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR) 
    1. Measure the resistance according to the value(s) in the table below

      Standard resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Switch Condition Specified Condition
    A67-11 (CANH) - A67-22 (CANL) Power switch OFF 108 to 132 Ω
    Fig 5: Identifying A67 No 1 Junction Connector Terminals
    G04953658Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR) 

    OK: REPLACE NO. 1 JUNCTION CONNECTOR 

  8. CONNECT CONNECTOR 
    1. Reconnect the A67 No 1 junction connector
  9. CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM - NO. 1 JUNCTION CONNECTOR) 
    1. Disconnect the A13 ECM connector.
    2. Measure the resistance according to the value(s) in the table below

      Standard resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Switch Condition Specified Condition
    A13-14 (CANH) - A13-13 (CANL) Power switch OFF 108 to 132 Ω
    Fig 6: Identifying A13 ECM Connector Terminals
    G04953659Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  10

    OK: REPLACE ECM  (See REMOVAL )

  10. CONNECT CONNECTOR 
    1. Reconnect the A13 ECM connector.
  11. CHECK FOR OPEN IN CAN BUS MAIN WIRE (HYBRID VEHICLE CONTROL ECU - ECM) 
    1. Disconnect the A74 hybrid vehicle control ECU connector
    2. Measure the resistance according to the value(s) in the table below

      Standard resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Switch Condition Specified Condition
    A74-13 (CA3H) - A74-14 (CA3L) Power switch OFF 108 to 132 Ω
    Fig 7: Identifying A74 Hybrid Vehicle Control ECU Connector Terminals
    G05787549Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (HYBRID VEHICLE CONTROL ECU - ECM) 

    OK: Go to next step 

  12. CHECK FOR OPEN IN CAN BUS MAIN WIRE (HYBRID VEHICLE CONTROL ECU - NO. 1 JUNCTION CONNECTOR) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Switch Condition Specified Condition
    A74-15 (CANH) - A74-16 (CANL) Power switch OFF 108 to 132 Ω
    Fig 8: Identifying A74 Hybrid Vehicle Control ECU Connector Terminals
    G05787550Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 1 JUNCTION CONNECTOR) 

    OK: REPLACE HYBRID VEHICLE CONTROL ECU  (See REMOVAL )

  13. CONNECT CONNECTOR 
    1. Reconnect the L97 No 2 junction connector.
  14. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - CENTER AIRBAG SENSOR) 
    1. Disconnect the L98 No 3 junction connector
    2. Measure the resistance according to the value(s) in the table below

      Standard resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Switch Condition Specified Condition
    L98-8 (CANH) - L98-19 (CANL) Power switch OFF 108 to 132 Ω
    Fig 9: Identifying L98 No 3 Junction Connector Terminals
    G04953660Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  16

    OK: Go to next step 

  15. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 2 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR) 
    1. Measure the resistance according to the value(s) in the table below

      Standard resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Switch Condition Specified Condition
    L98-7 (CANH) - L98-18 (CANL) Power switch OFF 108 to 132 Ω
    Fig 10: Identifying L98 No 3 Junction Connector Terminals
    G04953661Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR) 

    OK: REPLACE NO. 3 JUNCTION CONNECTOR 

  16. CONNECT CONNECTOR 
    1. Reconnect the L98 No 3 junction connector.
  17. CHECK FOR OPEN IN CAN BUS MAIN WIRE (CENTER AIRBAG SENSOR - NO. 3 JUNCTION CONNECTOR) 
    1. Disconnect the L73 center airbag sensor connector
    2. Measure the resistance according to the value(s) in the table below

      Standard resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Switch Condition Specified Condition
    L73-13 (CANH) - L73-22 (CANL) Power switch OFF 108 to 132 Ω
    Fig 11: Identifying L73 Center Airbag Sensor Connector Terminals
    G04953662Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO CENTER AIRBAG SENSOR (CENTER AIRBAG SENSOR - NO. 3 JUNCTION CONNECTOR) 

    OK: REPLACE CENTER AIRBAG SENSOR ASSEMBLY  (See REMOVAL )

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